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Old 06-15-2008, 06:06 AM   #1
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Default USB LED's ?

is it possible to strip down a usb cable and to find out which of the cables are power cables and run some 5V leds off it ?
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Old 06-15-2008, 06:12 AM   #2
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Default Re: USB LED's ?

Yer that is possible , although i dunno if 5v leds are readily available but if not just get like a 3.3v and throw a protection resistor in there
and the usb pinout is

1 VCC Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 GND Black Ground
sso you would connect the led to the 1st and 4th pin
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Old 06-15-2008, 07:04 AM   #3
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Default Re: USB LED's ?

Use this to calculate the value of the voltage drop resistor.
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Old 06-15-2008, 07:26 AM   #4
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Default Re: USB LED's ?

Quote:
Originally Posted by Remeniz View Post
Use this to calculate the value of the voltage drop resistor.
wish i had known about this last time i did an led job i worked it all out using the ohms law calculation

as for using about a 3v led you will want aprox 150ohms and max current of an led is about 15 miliamps
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Old 06-15-2008, 07:39 AM   #5
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Default Re: USB LED's ?

I know what you mean. Studied all this in college. Then I got lazy and used Excel to make my calculations.
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Old 06-15-2008, 08:18 AM   #6
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Default Re: USB LED's ?

Quote:
Originally Posted by Remeniz View Post
I know what you mean. Studied all this in college. Then I got lazy and used Excel to make my calculations.
yer i do electronics in college now , got to learn all sorts of formula
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Old 06-15-2008, 11:37 AM   #7
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Default Re: USB LED's ?

You can easily get 5v LED's
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Old 06-15-2008, 11:39 AM   #8
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Default Re: USB LED's ?

can you ,havent had experience with them myself we only use 3.3v blue ones max at college
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Old 06-15-2008, 11:40 AM   #9
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Default Re: USB LED's ?

Yeah I use them sometimes when I cant be bothered to find resistors and stuff, just to test things

5v and 12v LED's
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Old 06-15-2008, 11:46 AM   #10
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Default Re: USB LED's ?

Quote:
Originally Posted by BrynF_UK View Post
You can easily get 5v LED's
yeah theres lots of 5v LEDs about specially at maplins + i dont have a lort of experience with LED's ive only done 1 project before which was a light in the hood of my fish tank

i tried,

2 X 1.5V batterie -------- Switch --------- 3V LED ---------- 3V LED ------- 3V LED ------------ 2X 1.5V batteries,

that didnt work at all.

so in the end i did what i thought was wrong but it worked,

2X1.5V batteries ----------Switch --------------3V LED
................................../......|......\.............................
.............................../.........|.........\
........................3V LED.....3V LED......3V LED

basicly i had 6 LEDs and ran 6 cables from the switch to each led and 6 cabled from the negative back to the battery negative, this was very messy but it worked,

why didnt it work going 3V LED - 3V LED - 3V LED ?????

edit. jus looked at that link, so lets say i got 3V battery and 3V LED after the 1st LED id need a resistor = to the amount of current the 1st LED takes then after the 2nd id need 1 that the 1st and 2nd LED current takes?

i dont understand resistors help me please, noob
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